A parasite named after the Spanish word for "plague". Humans implanted with the parasite turn into Ganados. As0 Plagas are unable to survive for long on their own, they will jump and attempt to burrow into a new potential host given the opportunity.
There are two types of Plaga, a dominant "control" type, and a subordinate "dependent" type which can be manipulated by the control Plaga. Plagas are weak to light.